Cable structure assembly for preventing buffer layer from being burnt

Abstract

The utility model belongs to the field of cables, and provides a cable structure assembly capable of preventing a buffer layer from being burnt, which comprises a conductor wrapped by a shielding layer; the extruded semi-conductive buffer foaming layer and the corrugated aluminum sheath are arranged on the conductor from inside to outside, and the corrugated aluminum sheath is used for protecting the shielding layer and circulating current; the extruded semi-conductive buffer foaming layer has a semi-extruded state and a deformation state. Compared with the prior art, the utility model has the advantages that the extruded semi-conductive buffer foaming layer is adopted to replace a semi-conductive buffer water-blocking tape, so that the defect that the insulation resistance is increased due to the fact that insulated water-blocking powder is easily affected with damp and absorbs moisture is overcome, and the problems that the water-blocking tape is affected with damp, the resistance of the semi-conductive layer is increased and the buffer foaming layer is ablated are effectively avoided; therefore, the reliability of the cable structure during operation is improved, the failure rate of a power transmission line is reduced, and the service life of the cable is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of cables, and in particular relates to a cable structure assembly for preventing a buffer layer from burning. Background Art

[0002] The buffer water-blocking layer of the current high-voltage cable is wrapped with a semi-conductive buffer water-blocking tape. When the cable is running, the core heats up and expands, and the buffer water-blocking layer compresses to absorb the expansion, preventing the core from being crushed by the metal sheath; when water enters the cable, the water-blocking powder in the buffer water-blocking tape absorbs water and expands, playing a role similar to a "plug", preventing moisture from being conducted along the longitudinal direction of the cable and causing water to enter a long length.

[0003] The water-blocking powder of the semi-conductive buffer water-blocking layer is easy to absorb water and is an insulating material itself. After absorbing water, the resistance of the semi-conductive buffer layer increases, and it is easy to produce a high potential difference on both sides of the buffer layer, which in turn causes the semi-conductive buffer layer to burn and damage the insulating core, ultimately causing serious problems of cable breakdown and affecting the reliable operation of the power grid. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a cable structure assembly that can prevent the buffer layer from burning.

[0005] The utility model solves the technical problem by adopting a technical solution of providing a cable structure assembly for preventing the buffer layer from burning, comprising: a conductor, the outside of which is wrapped with a shielding layer;

[0006] An extruded semi-conductive buffer foam layer and a corrugated aluminum sheath are arranged on the conductor from the inside to the outside, and the corrugated aluminum sheath is used to protect the shielding layer and the flowing current; the extruded semi-conductive buffer foam layer has a semi-extruded state and a deformed state;

[0007] When the extruded semi-conductive buffer foam layer is in the semi-extruded state, the extruded semi-conductive buffer foam layer is closely attached to the corrugated aluminum sheath;

[0008] The extruded semi-conductive buffer foam layer in the deformed state can rely on elastic deformation to prevent the wire core in the conductor from being damaged when the outer diameter of the conductor expands or contracts due to heat or cold, and maintain electrical contact between the corrugated aluminum sheath and the shielding layer.

[0009] In the above-mentioned cable structure assembly for preventing the buffer layer from burning, the shielding layer comprises:

[0010] A conductor shielding portion, arranged outside the conductor;

[0011] The insulating layer and the insulating shielding part are wrapped around the conductor shielding part in sequence, the insulating layer is used to isolate the conductor; the insulating shielding part is used to improve the electric field distribution on the insulating surface.

[0012] In the above-mentioned cable structure assembly for preventing the buffer layer from burning, the extruded semi-conductive buffer foam layer is made of a material with elastic deformation function.

[0013] In the above-mentioned cable structure assembly for preventing the buffer layer from burning, a layer of aluminum tube is welded or extruded on the outside of the extruded semi-conductive foam layer, and the corrugated aluminum sheath is formed on the surface of the aluminum tube by corrugation.

[0014] In the above-mentioned cable structure assembly for preventing the buffer layer from burning, the inner diameter of the wave crest of the corrugated aluminum sheath is 1 mm-2 mm smaller than the outer diameter of the extruded semi-conductive buffer foam layer.

[0015] In the above-mentioned cable structure assembly for preventing the buffer layer from burning, the thickness of the extruded semi-conductive buffer foam layer is 1 mm to 2 mm greater than the depth of the corrugated aluminum sheath.

[0016] Compared with the prior art, the advantage of the utility model lies in that an extruded semi-conductive buffer foam layer is used instead of a semi-conductive buffer water-blocking tape, thereby eliminating the disadvantage that the insulating water-blocking powder is easily affected by moisture and absorbs moisture, causing an increase in insulation resistance, and effectively avoiding the problems of moisture on the water-blocking tape, increased resistance of the semi-conductive layer, and burning of the buffer foam layer, thereby improving the reliability of the cable structure during operation, reducing the failure rate of the transmission line, and helping to extend the service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the present application;

[0018] Figure 2 It is a schematic diagram of the structure of an extruded semi-conductive buffer foam layer in a semi-finished product.

[0019] In the figure, 1. conductor;

[0020] 2. Shielding layer; 20. Conductor shielding part; 21. Insulating layer; 22. Insulating shielding part;

[0021] 3. Corrugated aluminum sheath;

[0022] 4. Extruded semi-conductive buffer foam layer. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] like Figure 1 to Figure 2As shown, the utility model is a cable structure assembly for preventing buffer layer from burning, comprising: a conductor 1, with a shielding layer 2 wrapped on the outside; an extruded semi-conductive buffer foam layer 4 and a corrugated aluminum sheath 3 arranged on the conductor 1 from the inside to the outside, the corrugated aluminum sheath 3 is used to protect the shielding layer 2 and the flowing current; the extruded semi-conductive buffer foam layer 4 has a semi-extruded state and a deformed state; when the extruded semi-conductive buffer foam layer 4 is in the semi-extruded state, the extruded semi-conductive buffer foam layer 4 is tightly fitted with the corrugated aluminum sheath 3; the extruded semi-conductive buffer foam layer 4 in the deformed state can rely on elastic deformation to prevent the wire core in the conductor 1 from being damaged when the outer diameter of the conductor 1 expands and contracts due to heat and cold, and maintain electrical contact between the corrugated aluminum sheath 3 and the shielding layer 2.

[0025] like Figure 1 As shown, the conductor 1 in this scheme is a cross-linked core of a high-voltage cable. It should be noted that before the cable structure is formed, the corrugated aluminum sheath 3 and the extruded semi-conductive buffer foam layer 4 are semi-finished products, which can be referred to Figure 2 The state shown; and in this cable structure is formed into Figure 1 In the state shown, the extruded semi-conductive buffer foam layer 4 outside the cross-linked core is in a semi-extruded state, which is tightly fitted with the corrugated aluminum sheath 3, ensuring good electrical contact and longitudinal water-blocking performance between the core and the aluminum sheath; when the cable is in use, the change in the outer diameter of the core caused by the thermal expansion and contraction of the insulation can be absorbed by the extruded semi-conductive buffer foam layer 4 in a deformed state, thereby effectively preventing the insulation core from being crushed when it is heated and expanded, and the insulation core from being cooled and contracted, resulting in poor electrical contact due to the reduction of the outer diameter of the core, and avoiding the problem of discharge and burning of the extruded semi-conductive buffer foam layer 4. It can be seen that the cable structure in this scheme adopts an extruded semi-conductive buffer foam layer 4 to replace the semi-conductive buffer water-blocking tape in the prior art, eliminating the disadvantage that the insulating water-blocking powder is easily affected by moisture and absorbs moisture, causing an increase in insulation resistance, and effectively avoiding the problem of moisture in the water-blocking tape, an increase in the resistance of the semi-conductive layer, and ablation of the buffer layer. While improving the operating reliability of the high-voltage cable, it also reduces the failure rate of the transmission line, which is conducive to extending the service life of the cable.

[0026] The shielding layer 2 includes: a conductor shielding portion 20, which is arranged outside the conductor 1; an insulating layer 21 and an insulating shielding portion 22, which are wrapped around the conductor shielding portion 20 in sequence, the insulating layer 21 is used to isolate the conductor 1; and the insulating shielding portion 22 is used to improve the electric field distribution on the insulating surface.

[0027] like Figure 1As shown, the conductor 1 (i.e., the core of the cable) is covered with a conductor shielding portion 20, which, together with the insulating layer 21 and the insulating shielding portion 22 provided on the shielding layer 2 of the conductor 1, can not only protect the core of the cable, but also avoid the heat dissipation function of the cable being affected by the generation of a large magnetic field after the cable is energized, and at the same time effectively shield the core inside the cable, effectively control the electrical signal transmitted by the cable, and avoid it being interfered by the outside world.

[0028] Preferably, the extruded semi-conductive buffer foam layer 4 in this solution is made of a material having elastic deformation function, specifically, Figure 1 As shown, the extruded semi-conductive buffer foam layer 4 outside the cross-linked wire core is in a semi-extruded state, and relies on the close fit with the corrugated aluminum sheath 3 to ensure good electrical contact and longitudinal water-blocking performance of the wire core. It is also because the extruded semi-conductive buffer foam layer 4 in this scheme has a certain elasticity, so it is in a semi-extruded state. Figure 1 The extruded semi-conductive buffer foam layer 4 still retains a certain elasticity (i.e., it is in a deformed state at this time), which can absorb the change in the outer diameter of the core caused by the thermal expansion and contraction of the insulation during the use of the cable, effectively preventing the insulating core from being crushed when it expands due to heat, and preventing poor electrical contact due to the reduction in the outer diameter of the core when the insulating core cools and contracts.

[0029] It is worth mentioning that the corrugated aluminum sheath 3 and the extruded semi-conductive buffer foam layer 4 in this solution are semi-finished products, that is, Figure 2 In the state shown, this solution can weld or extrude a layer of aluminum tube on the outside of the extruded semi-conductive foam layer, and the aluminum tube is corrugated to form a corrugated aluminum sheath 3 on the surface, so as to protect the wire core, prevent corrosion, prevent thermal expansion and contraction and other effects, thereby extending the service life of the cable structure.

[0030] Preferably, the inner diameter of the corrugated aluminum sheath 3 (i.e. Figure 1 A) is smaller than the outer diameter of the extruded semi-conductive buffer foam layer 4 (i.e. Figure 2 D shown) 1mm-2mm.

[0031] Preferably, the thickness of the extruded semi-conductive buffer foam layer 4 (i.e. Figure 2 T) is greater than the depth of the corrugated aluminum sheath 3 (i.e. Figure 1 B or C shown) 1mm-2mm.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A cable structure assembly for preventing buffer layer from burning, characterized in that: include: Conductor, with a shielding layer wrapped around it; An extruded semi-conductive buffer foam layer and a corrugated aluminum sheath are arranged on the conductor from inside to outside, and the corrugated aluminum sheath is used to protect the shielding layer and the flowing current; the extruded semi-conductive buffer foam layer has a semi-extruded state and a deformed state; When the extruded semi-conductive buffer foam layer is in the semi-extruded state, the extruded semi-conductive buffer foam layer is closely attached to the corrugated aluminum sheath; The extruded semi-conductive buffer foam layer in the deformed state can rely on elastic deformation to prevent the wire core in the conductor from being damaged when the outer diameter of the conductor expands or contracts due to heat or cold, and maintain electrical contact between the corrugated aluminum sheath and the shielding layer.

2. A cable structure assembly for preventing buffer layer from burning according to claim 1, characterized in that: The shielding layer comprises: A conductor shielding portion, arranged outside the conductor; The insulating layer and the insulating shielding part are wrapped around the conductor shielding part in sequence, the insulating layer is used to isolate the conductor; the insulating shielding part is used to improve the electric field distribution on the insulating surface.

3. A cable structure assembly for preventing buffer layer from burning according to claim 1, characterized in that: The extruded semi-conductive buffer foam layer is made of a material with elastic deformation function.

4. The cable structure assembly for preventing buffer layer from burning according to claim 1, characterized in that: A layer of aluminum tube is welded or extruded on the outside of the extruded semi-conductive buffer foam layer, and the corrugated aluminum sheath is formed on the surface of the aluminum tube by corrugation.

5. A cable structure assembly for preventing buffer layer from burning according to claim 4, characterized in that: The inner diameter of the wave crest of the corrugated aluminum sheath is 1 mm to 2 mm smaller than the outer diameter of the extruded semi-conductive buffer foam layer.

6. A cable structure assembly for preventing buffer layer from burning according to claim 4, characterized in that: The thickness of the extruded semi-conductive buffer foam layer is 1 mm to 2 mm greater than the depth of the corrugated aluminum sheath.

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